The setting is browser.fixup.alternate.suffix. As far as I know, you have to set keyword.enabled to false or the search always takes precedence as on your friend's PC. There is no domain guess before a keyword search.
Slickdeals is able to share the best deals because of the contributions of users like you! If you found a great deal,
please share it with others by posting in our forums.
Welcome to Slickdeals!
Save money here by finding the lowest and cheapest price, best deals and bargains, and hot coupons. We're all about
community driven bargain hunting with thousands of free discounts, promo codes, reviews and price comparisons.
Don't worry, we'll help you find your way. If you haven't already, check out this
that explains the features of our site.